Originally Posted by Lsuduke
..... I did install an extra oil and tranny cooler to keep everything cool. ...
Two good points. At least the automatic transmission cooler to reduce the heat; this is the number one killer of an automatic, so towing, no matter how light, puts extra strain on the transmission.
A cooler, and more frequent automatic transmission flushes (not just a pan drop and filter change; that only nets you about 3 to 4 quarts or fresh transmission fluid; torque converter holds a bunch more that usually cannot be drained on its own; no drain plug on the newer torque converters).